15.9. The following table gives capital cost, average annual operating subsidy, and average weekday ridership for five alternative transit projects. Evaluate the cost-effectiveness of these alternatives by comparing the ratios of the added cost for each system to the projected increase in ridership. All other alternatives should be compared with the base (do nothing) alternative and with the TSM alternative. Assume a 5 percent annual interest rate and a 20 year design life for all systems. Alternative Base TSM B Capital cost, millions of $ 0 10 150 Ave. annual operating subsidy, millions of $ 1.7 4.5 10.0 12.5 16.5 Ave. weekday ridership, thousands 12.0 20.0 19.0 34.0 42.0 250 475